clean up following PEP8 rules

tracim/tracim/lib/email.py

         message['Subject'] = subject
         message['From'] = formataddr((
             self._global_config.EMAIL_NOTIFICATION_FROM_DEFAULT_LABEL,
-            self._global_config.EMAIL_NOTIFICATION_FROM_EMAIL)
-        )
-        message['To'] = formataddr(('',user.email))
+            self._global_config.EMAIL_NOTIFICATION_FROM_EMAIL,
+        ))
+        message['To'] = formataddr(('', user.email))
 
         text_template_file_path = self._global_config.EMAIL_NOTIFICATION_CREATED_ACCOUNT_TEMPLATE_TEXT  # nopep8
         html_template_file_path = self._global_config.EMAIL_NOTIFICATION_CREATED_ACCOUNT_TEMPLATE_HTML  # nopep8

tracim/tracim/lib/notifications.py

         else:
             email_address = email_template.replace('{user_id}', '0')
 
-        return formataddr((mail_sender_name,email_address))
+        return formataddr((mail_sender_name, email_address))
 
     @staticmethod
     def log_notification(
 
         for role in notifiable_roles:
             logger.info(self, 'Sending email to {}'.format(role.user.email))
-            to_addr = formataddr((role.user.display_name,role.user.email))
+            to_addr = formataddr((role.user.display_name, role.user.email))
 
             #
             #  INFO - D.A. - 2014-11-06